26
DIRIS A20
- Réf. : 536 085 C
DIRIS A20
- RS485 - JBUS/MODBUS
®
prelIMINary OperatIONS
Functions
The optional Communication module must be connec-
ted to the
DIRIS A20
(ref. 48250A20, 48250200,
48250A20UL). It provides an RS485 serial link (2 or
3 wires) with JBUS/MODBUS
®
protocol for the use of
DIRIS A20
from a PC or PLC.
General points
For a standard configuration, an RS 485 link is used to
connect up to 31
DIRIS A20
or
COUNTIS Ci
with a PC
or a PLC over a distance of 1500 metres, using JBUS/
MODBUS
©
protocol.
N 1
N 2
N n
R = 120
1200 M
R = 120
Programmable
controllers
Other systems
DIRIS 109 E GB
N 1
R = 120
Programmable
controllers
Other systems
repetor
RS485
0+- -+0
N n
R = 120
1200 M
1200 M
DIRIS 110 E GB
Recommendations:
You should use a shielded twisted pair (LIYCY type). In
a disturbed environment or large network (in terms of
length) we recommend the use of a shielded twisted
pair (type LIYCY-CY).
A repeater (1 channel) or an arrestor (4 channels)
should be used if you intend to exceed the distance
(1200 m) and/or maximum number (31) of
DIRIS
.
Please contact us for more information.
NB :
A 120 ohm resistance (found on the additional module)
must be fixed at both ends of the link.
Other solutions are available (modem, TCP-IP, optical
fibre, etc.). Please contact us
For personnel and product safety please read the
contents of these operating instructions carefully
before connecting.
Check the following points as soon as you receive
the
Diris A 20
package:
• the packing is in good condition,
• the product has not been damaged during transit,
• the product reference number conforms to your
order,
• the package contains the product and the operating
instructions.
GeNeral INfOrMatION
27
DIRIS A20
- Réf. : 536 085 C
DIRIS A20
- RS485 - JBUS/MODBUS
®
GB
DIRIS A20
- RS485 - JBUS/MODBUS
®
INStallatION
CONNeCtION
The module is fitted onto the back of the
DIRIS A20
in one of the two positions provided.
DIRIS 342 A
1
ON
1
ON
1
0V - +
R=120
DIRIS 347 A
3
DIRIS 343 A
2
Fix the module in one of the two positions.
4
Follow indications when connecting the terminal.
Switch on voltage supply.
The
DIRIS A20
must be switched off
Summary of Contents for DIRIS A20
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